I wouldn't recommend doing that unless you know exactly what you're doing. I know that "ep8_jill_state" is what determines if you got the sushi date, and by that point you're gold by setting it to 1. But there could be other variables that get called upon in the future that you would be missing. So again, just a warning.
You can be on Bella's path but still get Quinn (Neutral/DIK), but you cant jump on Quinn's path if you're already on Josy's, and you cant jump on Others at all either. To get on Quinn's path, you cannot be dating MJ in Episode 6, otherwise you cant help her after she gets mugged.
Jill and Maya/Josy both close the Others path during the Crossroads choice.